View Full Version : 9th Grade Algebra Review: Solve For x
RCitrin
Jan 6, 2008, 03:12 PM
Bah! I got this review sheet in my ninth grade algebra class with equations where we have to solve for x, and I don't remember how to do them.
Here is an example of the kind of problems we are doing:
2x - t = xy + 5
If someone could explain what to do, that would be great thanks!
s_cianci
Jan 6, 2008, 03:23 PM
Get the x by itself on one side of the equation. Treat the y and t as if they were ordinary numbers and do with them what you would do if they were ordinary numbers.
RCitrin
Jan 6, 2008, 03:39 PM
I'm still a little fuzzy... Here's what I've done so far:
2x - t = xy + 5
2x = t + xy + 5
2x - xy = t +5
Now do I divide 2 - y on both sides? I'm not so sure what to do...
cool_dude
Jan 7, 2008, 03:34 PM
OK so this is where you left of
2x - xy = t +5
now you take out the x on the left side so it looks like
x(2-y) = t + 5
now divide by 2-y both sides so you get
x = (t+5)/(2-y)
RCitrin
Jan 7, 2008, 09:05 PM
Ahhh I remember now. Thanks for your help!
cool_dude
Jan 8, 2008, 10:23 AM
Your welcome